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Give me the dirt on useing Grids
Old 07-24-2007, 05:18 PM   #1 (permalink)
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From what I have been reading grids are used to direct light to the places you want it. Right ? Now some things I have read say you can use grids to keep light off the backdrop and light the models hair. I have also read that you need to light the backdrop to give the image depth. So what am I missing here ? Is it all based on the look you want in the image ?

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Re: Give me the dirt on useing Grids
Old 07-24-2007, 07:22 PM   #2 (permalink)
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The grids are used for changing the angle of coverage of the light source. So, for example, if you use a 10 degree grid, then the light will cover about a 12" radius circle at 10' rather than probably covering the whole background without the grid. A 40 degree grid would cover a 48" radius circle at 10'. So in effect the grid gives you a spot light that controls the size of the circle of light that is projected on a scene at a given distance. You could use a grid to do any or all of the things you mention. But sometimes other modifiers might give more control. These might be snoots, or cinefoil, or louvres, or flags, or gobos, and so forth. Get a good book on lighting and you'll see examples of how these devices are used. Here is an example of using a light with a grid as a part of the scene itself:

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Re: Give me the dirt on useing Grids 


And here is a link to a nude shot that used to strip lights each with a grid and were also included in the scene.

http://www.glamour1.com/photoplog/index.php?n=1780

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Re: Give me the dirt on useing Grids
Old 07-25-2007, 02:21 PM   #3 (permalink)
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Thanks for the info and the image. It does clear up some of my questions..
So I guess for a hair light you would want like a 10 deg grid ?
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Re: Give me the dirt on useing Grids
Old 07-25-2007, 04:11 PM   #4 (permalink)
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Quote:
Originally Posted by That_Look_Photo View Post
Thanks for the info and the image. It does clear up some of my questions..
So I guess for a hair light you would want like a 10 deg grid ?
As a hair light is one use. But you could also use the narrow grids for simulating old time Glamour lighting like Hurrell uses (he used Fresnel hot lights). The grids shine whenever you need narrow controlled beams of light to selectively light the scene.
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Re: Give me the dirt on useing Grids
Old 07-27-2007, 07:23 PM   #5 (permalink)
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Quote:
Originally Posted by R_Fredrick_Smith View Post
As a hair light is one use. But you could also use the narrow grids for simulating old time Glamour lighting like Hurrell uses (he used Fresnel hot lights). The grids shine whenever you need narrow controlled beams of light to selectively light the scene.
Cheers,
rfs
Is it a general rule to use some kind of defusing
on the light with a grid to make the light area softer?
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Re: Give me the dirt on useing Grids
Old 07-27-2007, 07:34 PM   #6 (permalink)
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Quote:
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Is it a general rule to use some kind of defusing
on the light with a grid to make the light area softer?
The biggest factor in getting softer light is the size of the light source. The larger the light source, relative to the model, the softer the light and thus the more diffuse the shadows. Putting diffusion materials over the light just lowers the amount of light and scatters it a bit, but does not really make it much softer. Size is the key factor.

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Re: Give me the dirt on useing Grids
Old 07-27-2007, 08:12 PM   #7 (permalink)
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wow..I learned that in class and I forgot that. your right..
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